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Dec. 22, 1936. F. B. YINGLING COAL MINING MACHINE Original Filed July14, 1933 6 Sheets-Sheet, 1

Dec. Z2, 1936. F. B. YINGLING COAL MINING MACHINE Original Filed July14,` 1953 6 Sheets-Sheevt 2 6 Sheets-Sheet 5 F. B. YINGLING COAL MININGMACHINE Original Filed July 14, 19553vv` Dec. 22, 1936.

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ATTIP/VEYS Reissued Dec. 22, 1936 UNITED STATES PATENT OFFICE COALMINING MACHINE Frank B. Yingling, Hamilton, Ohio, assignor to Cyrus J.Fitton, Hamilton, Ohio 27 Claims.

This invention relates to coal mining machines, and has for its objectto provide, in connection with a link carrying a cutting mechanism,means independent of the link fortilting the cutting mechanism on thelink.

It is an object of this invention to provide, in connection with a linksupporting a cutting mechanism, means to swing the cutting mechanismlaterally on the link but independently of the link.

It is also an object of this invention to provide, in connection with amining machine, means for supporting one end of a link which has on itsother end a cutting mechanism, said means comprising elements adapted toconnect the shaft-sections from which the cutting mechanism is operated.

It is also an object of this invention to provide, in connection with a.rotatably mounted casing, means for pivotally supporting one end of alink, which has on its other end cutting mechanism, and means supportedby the casing for rotating the cutting mechanism with relation to thelink, said last Anamed means being out of parallelism with the link.

It is a further object of this invention to provide, in connection witha mining machine a rotatably mounted casing, a shaft in the casingsupporting one end of a link which has on its other end cuttingmechanism, means operated by the shaft through said link for operatingthe cutting mechanism, a second link adjustably connected at one end tothe casing and pivoted at its other end to the cutting mechanism, meansoperatively connected to the shaft for adjusting said second link, andmeans connected to the shaft and extending through the second link forswinging the cutting mechanism in any desired plane within the limits ofthe machine, for elevating the rst named link on the shaft and forelevating the cutting mechanism on the first named link.

A particular object of my invention isto provide non-parallel links, thepivotal centers of which are connected by lines always out ofparallelism. By eccentrically adjusting the pivotal support of one ofsaid links it is possible to very accurately position the angularity ofthe kerf cutter irrespective of the position of the links, and by havingthe links out of parallelism between their pivotal centers it ispossible to thereby quickly determine the displacement of the kerfcutter from the desired plane and correct the error, whereas withparallel links there may be material divergences from the desired planewithout the ability of correcting them. It is my object to avoid suchparallelism, and bring about this improved adjustment in kerf cuttingcontrol, by the use of linkage in the shape of a trapezium, i. e. afour-sided figure of which no two sides are parallel.

When properly adjusted, the articulated supporting head, the cuttingmechanism, and the intermediate adjustable linkage form a rigid unit,and this intermediate linkage, which is adjusted asl by means of aneccentric, -is pivotally supported on and operated through fourtransversely extending axes or shafts of the machine, which axes aredisposed at the four corners of a trapezium.

These and other advantages will appear from the following descriptiontaken in connection with the drawings.

Referring to the drawings:

Figure 1 is a vertical longitudinal section through the mining machine.

Figure 2 is an enlarged view on a line similar to that of Figure 1,showing the rear end of the truck.

Figure 3 is a top plan view of the machine.

Figure 4 is a horizontal section showing the mechanism for operating thecutter.

Figure 5 is a horizontal section through the auxiliary link, showing themechanism for ele-` vating the cutter blade supporting link of themachine, for swinging the cutter blade laterally, and for elevating thecutter blade with respect to the cutter blade supporting link.

Figure 6 is a vertical longitudinal section through the front end of thetruck and the part of the mining machine adjacent thereto, with theauxiliary link shown in side elevation.

Figure 7 is a vertical longitudinal section through the cutter head.

Figure 8 is a section on line 8-8 of Figure 1.

Figure 9 is a section on line 9 9 of Figure 1.

Figure 10 is a fragmentary view showing the eccentric connection betweenone end of the supporting link and the supporting head.

Figure 11 is a. fragmentary view partly in section, showing the gearsfor rotating the supplementary link eccentrics.

Figures l2 to'15, inclusive, show the mechanism by which power istransmitted from a motor to the rotating head, and from the same motorto the wheels of the truck for transporting the truck.

Figure 16 is a section through the truck, showing the motor and theshaft from which the truck is driven and the head is rotated.

The transporting part of the mining machine comprises a truck body orframe I, supported on axles 2 having wheels 3 adapted to travel uponsome suitable trackway. On the rear end of the frame is a motor 4adapted to operate a shaft 5 connected at its rear end to the motor andsupported at its other end in bearings 8 located in a supporting head 1,rotatably mounted in a stationary head 6 o-n the front end of the frameI.

On the forward end of the shaft 5 is a gear 9, while on the rear end ofthe supporting head 1 is a Worm gear I0, partly enclosed by means of ahousing or casing II, and engaging a worm I2 by which it is operated.The wheels and axles are rotated by means of shafts I3 operativelyconnected to the axles by means of gears I4. On the front end of thesupporting head 1, which is in front of the stationary head, is a casingI5, which has on opposite sides forwardly extending arms I6. There aretwoy of these arms, each of which is provided with a hole for receivinga sleeve I1.

These sleeves are in alinement and each has in its inner end bearingmembers I8, which rotatably support one end of a shaft 20. The outerends of these sleeves are closed by means if caps I9. These capst withinthe sleeves and engage the bearing members and form with the bearingmembers and the ends of the shaft lubricant chambers. Adjacent one endof the shaft 20 is a gear 2I, which engages the gear 9 s0 that the shaft20 rotates upon the rotation of the shaft 5. Adjacent the other end ofthe shaft 20 is a second gear 22, which meshes with a gear 23 located onone end of a longitudinally extending shaft 24 supported by suitablebearing in a link 25.

This link has at one end a pair of arms 26. Each arm is provided with ahole having a bushing 21 therein. Each bushing flts over one of thesleeves I1 so that one end of the link is supported by means of the twosleeves I1. The arm end of this link ts between parts of the arm I6 onthe casing I5.

On the arms 26 are gear segments 28 attached thereto by means of boltsor screws 29. 'I'here are two of these segments, each one engaging aworm 3|) located on a vertically disposed shaft 3|, supported bysuitable bearings in the casing I5. On the upper end of each shaft 3I isa gear 35, later to be described. On the shaft 20 between the gear 2Iand one of the sleeves I1. is a gear 32. The purpose and operation ofthis gear will be described later.

The shaft 24 is supported in a casing 33 by means of bearing members 34located in one end of the casing. This casing is supported in somesuitable manner in the interior of the link 25. The shaft 24 forms anintegral part of another shaft 35 supported in bearings 36 in the casing33. These two shafts are connected by means of clutch mechanismconsisting of an element 31 rigidly attached to the shaft 35, and amovable clutch element 38 slidably mounted on the shaft 24 and adaptedto engage or disengage the element 31.

The clutch element 38 is moved longitudinally on the shaft 24 by meansof some suitable connection between the element and the shaft 39supported on the link 25 of the casing 33. This shaft is operated bymeans of a lever 40, which has on one end a plunger 4I for holding y itln adjusted positions. 'I'his plunger engages some suitable hole orsocket in one side of the link 25. On the forward end of the link 25 isa pair of forwardly extending arms 42, each of which is provided with anopening in which there is located a bushing 43. Within each bushing is asleeve 44. These sleeves are in alinement and each has in its inner endbearing members 41.

'I'he sleeves 44 serve to pivotally support the cutter head 52, whichhas extending rearwardly therefrom two pairs of arms 45 and 46. Thesearms are provided with holes to receive the sleeves 44. This connectionbetween the cutter head and the link 25 is illustrated in Figure 4. Thebearings serve to rotatably support the ends of a shaft 49. Each sleeve44 has on its outer end a cap 48, which serves to form, in connectionWith the bearings and the ends of the shaft 49, lubricant chambers.

The shaft 49 is rotated by means of a gear 50 mounted upon one endthereof and engaging a gear 5I mounted on the forward end of the shaft35. The cutter head 52, which` is at the front of the arms 45 and 46, issomewhat circular in shape and has therein bearings 53,

which support one end of a shaft 54. The end of the shaft to the rear ofthe bearing member 53 has thereon a gear 55 which meshes with a gear 56on the end of the shaft 49 remote from the gear 50.

The cutter head in advance of the bearing 53 is provided with a bearing51, which rotatably supports the front end of the shaft 54. Adjacent thebearing 51 the shaft 54 is provided with a gear 56 which meshes with agear 59 located on a vertical shaft 60. 0n the upper end of the cutterhead there is provided an upwardly extending annular projection 6 I,while on the lower part of the cutter head there is provided adownwardly extending annular projection 62. Within the upper projection6I are bearings 63 which serve to rotatably support the upper end of theshaft 60. Within the lower annular projection 62 are bearing members 64,which rotatably support the lower end of the shaft 6I).

The numeral 65 indicates a cutter bar, which has an upper arm 66 havinga hole therein, with a bushing 61 fitting about the upper annularprojection 6I, and a lower arm 68, which flts around the lower annularprojection 62. means of these projections and arms the cutter bar isrotatably supported on the cutter head. Fitting about the lower end ofthe shaft 60 and against the annular projection 62 and the bearingmembers 64 is a disc 16.

Fitting within the annular projection 6I and against the upper bearing63 is a sleeve 1I. This sleeve, together with a plate 12, forms alubricant chamlber about the upper end of the shaft 6I). On the lowerend of the shaft 60 is a sprocket wheel 13 used for driving a cutterchain 14. Located on the upper arm 66 is a worm gear 15, which is heldthereon by means of a clamp plate 15a. Located on the upper arm, infront of the worm gear 15, is a bracket 16, which has pivoted thereto adog 11 adapted to engage the teeth of the worm gear to prevent itsrotation with relation to the cutter head.

The foregoing structure serves to operate the cutter chain by means ofmechanism extending from the shaft 20 to the shaft 60. The gear 32 onthe shaft 20 meshes With'a gear 18 located on a transversely disposedshaft 19, supported in suitable bearings in the casing I5. This gear 18fio Ament 92 engaging the clutch element 89.

meshes with .a gear 80 mounted lon Atlseslaift 8| vmounted upon a sleeve88 loosely mounted on the shafti. 'This sleeve has on its inner end aclutch element :89.

Between the clutch elements 83 and 89 and mounted on the shaft 8| is 'asleeve '90, which has on one end a clutch element9'l adapted to engagethe clutch element 83, and on its `"other 'end a clutch element 92adapted to engage the clutch element 89. The clutch elements areenclosed within a casing 93a which supports suitable clutch shiftingmeans 93. Adjacent each end of the shaft 8| is a worm 94 engaging theworm -gear '95, located on the upper end of the shaft 3|.

The shaft 8| is rotated in one direction through the following chain ofgears: gear 32 located on the shaft 20; gear 18; gear 80 located on thesleeve 82. 'This sleeve is caused to rotate with'the shaft through theclutch element 9| engaging the clutch element 83.

In order to rotate the lshaft 8| in reverse direction `it is operatedthrough the following chain of gears, starting with the gear 32 mountedon the shaft 20. This gear 'drives thegear 18; gear 84 on shaft 85; gear88 on the shaft 85 meshing with the gear 81 on the sleeve 88 and theclutch ele- By means of these chains of operation the link 35 is causedto swing on the sleeves I1 through the operation of the worms 30 on thegear segments 28.

The gear 18 also engages a'gear 95 integral with a sleeve 91 rotatablymounted yonithe shaft 98. The sleeve 91 has thereon a worm 99. On oneend of the shaft 28 and attached thereon by means of a spline is abushing |00, which is rotatably mounted in a bearing |0| formed in oneof the arms I8 extending forwardly from the casing I5. On the other endof the shaft and splined thereto is a bushing |02 rotatably supported ina bearing |03 formed in the other one of the forwardly extending arms I6'of the casing I5.

On the outer end of each of the bushings |00 and |02 is an eccentric|04. These eccentrics serve as adjustable supports for the rear end of alink |05, which has extending rearwardly therefrom arms |06, each ofwhich is provided with a circular opening to receive one of theseeccentrics. suitably supported by some part oi one of the arms I8 is acasing |01, which encloses the worm 99 and the Worm gear slidablymounted on one end of a shaft |09.

This casing |01 is provided with a circular extension |08 for housingone end of the shaft |09, supported in bearings in the casing and insome suitable part oi' the frame structure of the link |05. The shaft|09 is surrounded by a bushing |0 located adjacent the worm gearExtending from the casing ina forwardly direction and surrounding theshaft |09 and the bushing ||0 is a sleeve ||2 which has slidably mountedtherein a sleeve ||3 supported at one end on the link |05. These twosleeves substantially enclose the shaft |09.

Within the sleeve I I3 and around the shaft |09 isa :bushing I I4. Thevbushing Il'and thev sleeve Hlmtherwithth'e bushing ||'0, provide-aspace around the shaft |89 vin which a shoulder |15 4on the shaft |09may oscillate with the shaft. The 'mechanism just described .providesfor a longitudinal movement of the casing |81 on the shaft |09, duetothe action of the eccentrics on the link |05.

Onthe forward end "ofthe shaft |09 is 'a gear IIS which meshes withgears VI I1 and |I8 loosely :mounted on ashaft I9. Integral with thegear H1 isa lgear |20. Between'thegears ||1 and |20 and the shaft ||9 isa bushing |2|,'whi1e supporting `these two gears in suitable bearings inpart of the v:link structure is `'abtsh'ing |22. The gear |20 mesheswith a gear |28 located on one end of a shaft |24 supported in bearings|25 formed in some suitable part of the link |05.

0n the other end of this shaft |24 are Vtwo gear members |26 .adapted tobe yengaged by a clutch |21 slidably mounted on the shaft |24therebetween. 'Ihese gears are .rotatably mounted on the shaft |24andare selectively caused to rotate therewith by means of this clutch|21.

'Ihese two gears |26 and the clutch |21 'are en- "i closed in a casing|28. The two gears |25 mesh with a gear |29 on one end of `a, shaft |30,which has adjacent its other end a worm'lISI in mesh with a worm gear|32 located on one en'd of the shaft 98.

Between the gears I|1 and ||8 .and on the shaft 'H9 is va clutch |33slidably mounted on the shaft for causing the gears to rotateselectively with the shaft. On one end of the shaft I I9 is a sleeve |34supported in a bushing |35 mounted in some suitable part of the link|05. 0n the extreme end of this shaft, beyond the sleeve |34 is a latchdisc |36 adapted to be adjustabiy connected to the sleeve by means oflock members |31 mounted on the sleeve and adapted to engage the teethof the disc.

The sleeve |34 has lthereon gear teeth |38 adapted to engage a gear |38aattached to a 'sleeve |39 rotatably mounted on a shaft |40. On one endof the shaft |40 is a bushing |4| supported in bearings |42 on the link|05. There is also provided in this link structure a bearing |48 for thesleeve |39. On the other end of the shaft ||9 from the gear teeth |38 isa sleeve |44 'which is supported in 'a bushing |45 provided 'in asuitable bearing in the link |95. Between the shaft ||9 and the sleeve|44 is a bushing |46. This end of the shaft ||9 is also provided with atoothed disk |41, engaged by an adjusting means |48 located on thesleeve |44.

The sleeve |44 is provided with teeth |49 which engage a gear |58mounted upon a sleeve |5| supported 1n bearings |52 in the link |05.This sleeve is rotatably mounted upon a shaft |53, which is in line withthe shaft |40 and is supported by means of bearings |54 in the link |05.Surrounding the adjacent ends of the shaft |40 and the shaft |53 is aclutch mechanism |55. This clutch mechanism is composed of two partsadapted to rotate independently, but which are moved togetherlongitudinally on the shaft. One part of this clutch mechanism willengage a corresponding clutch mechanism on the sleeve |39, while theother part lof this clutch mechanism will engage a clutch member on oneend of the sleeve |5I. These two shafts may be' caused to rotate'selectively but are never rotatively driven at the same time.

On the outer end of the shaft |58 is a gear |58 which meshes with a.pinion |51 located on one end of a. shaft |58. On the outer end of theshaft |40 is a pinion |59 which meshes with a gear |60 on the end of theshaft |58 opposite the pinion |51. The pinion |51 also engages andoperates a gear |6| located on one end of a shaft |62. On each end ofthe shaft |62 is a sleeve |63 mounted `in bearings provided therefor inarms |64, provided on the forward end of the link |05. Between the twosleeves |63 is a Worm |65 splined on `the shaft |62. Between this wormand each sleeve is a thrust bearing |66.

Extending rearwardly from the cutter head is a plurality of arms |61,which are provided with holes therein to receive the sleeve |63. Thesearms interconnect with the forwardly extending arms of the link |05 sothey cannot move longitudinally of the shaft with respect to the link|05, but may freely rotate on the shaft. The worm |65 engages the wormgear 15 for swinging the cutter head about the shaft 60.

The power is transmitted from the motor 4, through the shaft 5 to theshaft 20, which serves to communicate power to two lines ofpowertransmission, one through the main link 25 for operating thecutter,` located on the cutter bar, and the other through an auxiliaryor supplementary link |05, for adjusting the auxiliary link |05, and forshifting the cutter bar laterally on its pivot on the cutter head.

For the purpose of controlling the application of power to the variousparts the supplemental link is provided with clutches, in connectionwith the gear mechanism, for changing the direction and the points ofapplication of power transmitted from the shaft 20.

From the shaft 20 power is transmitted through shafts 24 and 35 to shaft49, from which motion is transmitted to the shaft 54 for operating thesprocket wheel to which the cutter is applied. From the shaft 20 poweris transmitted through the gear 32 and the shaft 8| for rotating theshafts 3|, by which the links are tilted so that the cutter head may beelevated or adjusted.

The cutter head lmay be rotated on the outer end of the main link,through the eccentric mechanism located on the rear end of the auxiliaryor upper link |05, operatively connected with the shaft 20. Through aseries of gearing between shaft 20 and the shaft |62 the worm |65 isoperated for swinging the cutter bar laterally or in its variouspositions.

It should be particularly noted that a line drawn between the centers|62 and 98 will not be parallel to a line drawn between the centers 20and 49. Nor will a line drawn between the centers 98 and 20 be parallelwith a line drawn between the centers |62 and 49. These four pivots 20,49, 98 and |62 form a linkage in the shape of a trapezium, with no twolines between pivot points in parallelism. In other words the links areout of parallelism and are of unequal length between pivots 98-I62 and20-49, the upper link |05 being longer than the lower link 25, as willbe seen in Figure 1. Being out of parallelism the necessity isdemonstrated to the operator constantly for adjusting the eccentricsupport of the shaft 98 in order to bring the kerf cutter into thedesired plane. This results in constant attention to this factor ofoperation, with a correspondingly greatly increased accuracy in thelocation of the kerf in the desired plane, with a resulting increase inthe amount of coal mined. 'I'he supporting or rotating head 1 is rotatedby means of a motor |68 suitably supported on the truck. This same motoris used for propelling the truck along a track. On one end of the motorshaft is a pinion |69. which l meshes with an idler pinion |10, engaginga gear |1| mounted upon a shaft |12 rotatably supported in suitablebearings on the truck frame.

On one end of the shaft |12 is a gear |13 meshing with two other gears|14 and |16, rotatably mounted on a shaft |16. Integral with the gear|14 is a clutch member |15 adapted to be engaged by a clutch membermounted upon the shaft |16 but rotatable therewith. On the gear |18 is aclutch member |19 adapted to be engaged by a clutch member |60 slidablymounted on the shaft |16, but rotatable therewith. 'Ihe clutch elements|11 and |80 -are operated simultaneously to be engaged with ordisengaged from the clutch elements |15 and |19. By means of thesevarious clutch elements the direction of rotation of the shaft |16 maybe controlled. The gears |13, |14, and |18 are enclosed within a housing|6|.

On one end'of the shaft |16 isa pinion |82 meshing with a gear |63 onone end of a,shaft |84, which has on its other end a pinion |65 inengagement with a gear |86 mounted on one end of a shaftV |81, whichcarries the worm I2, which engages the worm gear |0 for rotating thehead 1'.y

Amxed to the shaft |12 and adjacent one end thereof is a gear |86 whichmeshes with a gear |89 mounted on a shaft |90. Attached to the `gear |89is a clutch element |9I, which is adapted to be engaged by a clutchelement |92 slidably mounted onthe shaft |90 for rotation therewith. Onthe end of the shaft |12, remote from the gear |86, is a gear |93 whichengages an idler pinion |94 in engagement with a pinion |95 mou-ntedalso on the shaft |90.

Attached to the pinion |95 is a. clutch element |96 adapted to beengaged by a clutch element |91 suitably attached to the clutch element|92 for simultaneous operation therewith, by means of a clutch operatingmeans |96. By the operation of the clutch elements |92 and |91 thedirection of rotation of the shaft |90 may be determined. `On one end ofthe shaft |90 is a worm |99 in engagement with a worm gear 200, mountedon a shaft 20|. On one end of the shaft 20| is a gear 202 in operativeengagement with a gear 203 aflxed to one en'd of a shaft 204. This shaft204 has thereon a worm 205 which engages a worm gear 206 mounted on alongitudinally extending shaft 201.

The gear 206 has thereon a clutch element 206 adapted to be engaged by aclutch member 2|| slidably mounted on the shaft 201. This clutch 2| isadapted to engage a clutch element 2|0 mounted upon a gear 209,rotatably mounted on the shaft 201. This gear 209 engages a pinion 2|2,which is integral with the gear |68.

There is also mounted on the shaft 201 a gear 2|3 which meshes with agear 2|4 on the shaft |3. The shaft |3 is the shaft which drives theaxles for rotating the wheels that carry the truck. The truck is driventhrough the shaft 201. This shaft maybe rotated through the gear 206 orthrough the gear 209, depending upon which clutch element is engaged bythe clutch 2| If the clutch element 208 is engaged by the clutch 2|| thetruck is caused to travel through the operationv of the shaft 204, thegear mechanism between this shaft, and the shaft |12.

In the event that the clutch 2|| is in engagement with the clutchelement 2||| the truck is propelled by the operation of the shaft 201directly through the shaft |12. This direction of movement of the truckmay be controlled by operation of the clutches |92 and |91. Thedirection of rotation of the head 'l is controlled by the movements ofthe clutch elements |15 and |19. 'I'he speed with which the trucktravels is regulated by means of the clutch 2| I. The side frame is cutaway adjacent the gears 202 and 203 to provide a passageway throughwhich these gears may be changed so that gears of different sizes may beused for varying the speed. A closure 2|5 is provided for covering thegears 202- and 20'3.

It will be understood that I desire to comprehend within my inventionsuch modifications as come within the scope of my claims and myinvention.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:-

l. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, a link having at one end arms pivotally mounted on the sleeves,bearings in each sleeve, a shaft ln the bearings, a cutter mounted onthe other end of the link, and an operative connection between the shaftand the cutter.

2. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, bearing members in one end of each sleeve, a; cap in the other endof each sleeve, a shaft in the bearings, and cutter means pivotallysupported on the sleeves and operatively connected to the shaft.

3. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, bearing'members in each sleeve, a shaft mounted in the bearings, alink having at one end arms pivotally mounted on the sleeves, a cutterhead pivoted to the other end of the link, a cutter on the headoperatively connected tothe shaft, and a second link pivoted at one endto the cutter head and connected at its other end to the arms by*eccentrics.

4. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, a shaft supported at each end in one of the sleeves, a link pivotedat one end on the sleeves, cutter mechanism supported on the other endof the link and operatively connected to the shaft, a bushing rotatablymounted in each arm, an eccentric on the bushing, a second link pivotedat one end on the eccentrics and' pivoted at its other end to the cuttermechanism, and means for rotating the bushings.

5. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, a shaft supported at each end in one of the sleeves, a link pivotedat one end on the sleeves, cutter mechanism supported on the other endof the link and operatively connected to the shaft, a bushing rotatablymounted in each arm, an eccentric on the bushing, a second link pivotedat one end on the eccentrics and pivoted at its other end to the cuttermechanism, means for rotating the bushings, and meansv operativelyconnected to the shaft for swinging the cutter mechanism.

6. In a mining machine, a casing having a pair of arms, a sleeve ineach-arm, a shaft supported ateach end in one of the sleeves, a linkpivoted at one end on the sleeves, cutter mechanism supported on theother end of the link and operatively connected to the shaft, a bushingrotatably mmmtedin each arm, an eccentric on the bushing, a second linkpivoted at one end on the eccentrics and pivoted atits other end to theAcutter y, ,means for rotating the bushings, and

means operatively connected to the shaftJ and supported by the secondlink for swinging the cutter mechanism.

7. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, bearing members in each sleeve, a shaft supported by the bearingmembers, a link having at one end a pair of arms rotatably mounted uponthe sleeves, said link having at its other end a pair of arms, a sleevein each of said last-named arms, a cutter' head having a pair of armspivotally mounted on the last-named sleeves, bearing members in thelastnamedf sleeves, a shaft supported by the lastnamed bearing members,an operative connection between the shafts, and a cutter supported bythe cutter head and operatively connected to the second-named shaft.

8. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, bearing members in each sleeve, a shaft supported by the bearingmembers, a link having at one end a pair of arms rotatably mounted uponthe sleeves, said link having at its other end a pair of arms, a sleevein each of said last-named arms, a cutter head having a pair of armspivotally mounted on the last named sleeves, bearing members in thelast-named sleeves, a shaft supported by the last-named bearing members,an operative connection between the shafts, a cutter supported by thecutter head and operatively connected to o the second-namedshaft, andmeansl connecting the casing to the cutter head for rotating the cutterhead with relation to the link.

9. In a mining machine, a casing having a pair of arms, a sleeve in eacharm, bearing members in each sleeve, a shaft supported by the bearingmembers, a link having at one end a pair of arms rotatably mounted uponthe sleeves, said link having at its other end a pair of arms, a sleevein each of said last-named arms, a, cutter head having a pair of armspivotally mounted on the last-named sleeves, bearing members in thelastnamed sleeves, a shaft supported by the last named bearing members,an operative connection between the shafts, a cutter supported by thecutter head and operatively connected to the sec'- ond-named shaft, andmeans connecting the casing to the cutter head for rotating the cutterhead with relation to the link, said means cornprising a link pivoted atone end to the cutter head and adjustably connected at its other end tothe casing.

10. In a mining machine, a casing having a pair of arms, a sleeve ineach arm, bearing members in each sleeve, a shaft supported by thebearing members, a link having at one end a pair of arms rotatablymounted upon the sleeves, said link having at its other end a pair ofarms, a sleeve in each of said last-named arms, a cutter head having apair of'arms pivotally mounted on thelast-named sleeves, bearing membersin the last-named sleeves, a shaft supported by the last-named bearingmembers, an operative connection between the shafts, a cutter supportedby the cutter head and operatively connected to the second-named shaft,and means connecting the casing to the cutter head for rotating thecutter head with relation to the link, said means comprising a linkpivoted at one end to the cut;- ter` head and connected at its other endto'an eccentric rotatably mounted in the casing.

11. In a mining machine, a casing having thereon a pair of sleeves,bearing members in eachy sleeve, a shaft supported by the bearingmembers, alink pivotally supported `at one end on the sleeves, and meansoperatively connected to the shaft for swinging the link about thesleeves.

12. In a mining machine, a casing having thereon a pair of sleeves,bearing members in each sleeve, a shaft supported by the bearingmembers, a link pivotally supported at one end on the sleeves, and meansoperatively connected to the shaft for swinging the link about thesleeves, said means including a gear on the shaft, a second shaft havinga pair of rotatably mounted gears thereon, a clutch mechanism on saidsecond shaft to cause one or the other of said pair of gears to rotatethe second shaft, and a, connection between each gear of the pair ofgears and the gear on the first-named shaft.

13. In a mining machine, a casing having a shaft rotatably mountedthereon, a link pivoted at one end to the casing, a cutter head pivotedto the other end of the link, a cutter pivoted on the head, meansextending through the link from the shaft for operating the cutter, asecond link attached at one end to the cutter head, means connecting theother end of the second link to the shaft and forming a support for theshaft to move the second link longitudinally to move the cutter head onits pivot, and means extending from the shaft through the second link tomove the cutter on its pivot.

14. In a mining machine, a support having a shaft rotatably mountedthereon, a link pivoted at one end to the support, the other end of saidlink having thereon a pair of arms, a sleeve in each arm, a shaftrotatably mounted in the sleeves and operatively connected to thefirstnamed shaft, a cutter head having arms pivotally mounted on thesleeves, a cutter pivoted on the head and operatively connected to thesecondnamed shaft, means connecting the mst-named shaft to the cutterhead, arms to move the cutter head about the sleeves, and meansextending from the first-named shaft through the connecting means toswing the cutter head on its pivot.

l5. In a mining machine, a cutter head having a pair of arms thereon, apair of alined sleeves in the arms, a link pivoted at one end on thesleeves, a second pair of alined sleeves in the arms, a second linkpivoted at one end to the second pair of sleeves, a cutter pivoted tothe cutter head, a shaft mounted in the rst-named pair of sleeves andoperatively connected to the cutter, a second shaft mounted in thesecond-named sleeves and connected to the cutter to move it on itspivot, and means to pivotally support the other ends of the links.

16. In a mining machine, a cutter head having a pair of arms thereon, apair of alined sleeves in the arms, a link pivoted at one end on thesleeves, a second pair of alined sleeves in the arms, a second linkpivoted at one end to the second pair of sleeves, a cutter pivoted tothe cutter head, a shaft mounted in the first-named sleeves andoperatively connected to the cutter, a second shaft mounted in thesecond-named pair of sleeves, and connected to the cutter to move it onits pivot, means to pivotally support the other end of the first-namedlink, and means to adjustably support the other end of the secondnamedlink.

17. In a mining machine, a cutter head having thereon a pair of arms anda pair of annular projections, bearing members in each projection, ashaft rotatably supported in the bearings, a cutter bar pivotallymounted at one end on the projections, a cutter member on said .cutterbar operatively connected to the shaft, a link pivoted at one end to thearms and having therein means to rotate the shaft, a second link pivotedat one end to the arms, a support to which the other end of thefirst-named link is pivoted, means to adjustably connect the other endof the second link to the support, and means to rotate the cutter bar,said means including a worm supported by said first-named means.

18. In a mining machine, a cutter head having thereon a pair of arms anda pair of annular projections, a shaft rotatably mounted in theprojections, a cutter bar pivoted at one end on the projections, acutter member on said cutter bar operatively connected to the shaft, alink pivoted at one end to the arms, a support pivoted to the other endof the link, a shaft rotatably mounted on the support and operativelyconnected to the first-named shaft, an eccentric mounted on the support,a second link pivoted at one end to the arms and connected at its otherend to the eccentric, and means on the second link operatively connectedto the second-named shaft to` rotate the eccentric to move the secondlink longitudinally.

19. In a mining machine, a casing having thereon a pair of sleeves,bearing members in each sleeve, a shaft rotatably supported by thebearing members, a link pivoted at one end on the sleeves, a cuttermechanism pivotally mounted on the other end of the link and operativelyconnected to the shaft, a second link pivoted at one end to the cuttermechanism, and means connecting the other end of the second link to theshaft to move the second link longitudinally to move the cuttingmechanism on its pivot.

20. In a mining machine, a casing having thereon a pair of sleeves,bearing members in each sleeve, a shaft rotatably supported by thebearing members, a link pivoted at one end on the sleeves, a cuttermechanism pivotally mounted on the other end o-f the link andoperatively connected to the shaft, a second link pivoted at one end tothe cutter mechanism, and means connecting the other end of the secondlink to the shaft to move the second link longitudinally to move thecutting mechanism on its pivot, said means comprising an eccentricengaging the second link.

21. In a mining machine, a supporting head, a. link pivoted at one endto said head, a cutter head pivoted to the other end of the link, acutter bar pivoted to the cutter head, a second link pivoted at one endto the cutter head, a shaft having a fixed eccentric thereon engagingthe other end of the second link for moving it longitudinally to rockthe head on the first-named link, a sleeve rotatably mounted on theshaft, means to rotate the sleeve, a shaft operatively connected to saidsleeve, a connection between said shafts, whereby on rotation of thesleeve the first-named shaft may be rotated in veither direction, and aconnection between the last-named shaft and the cutter bar, whereby onrotation of the sleeve the cutter bar may be swung about its pivot onthe cutter head in two directions.

22. In a, mining machine, a casing having a pair of arms, a sleeve ineach arm, bearing members in each sleeve, a shaft mounted in the bearingmembers, a link having at one end armsv pivotally mounted on thesleeves, a cutter head pivoted to the other end of the link, a cutter onthe head operatively connected to the shaft, a second link longer thanthe first link pivoted at one end to the cutter head, and eccentrlcsconnecting the other end of the second link to the arms.

23. In a mining machine, a casing having a pair of arms, a sleeve ineach arm, bearing members in each sleeve, a shaft mounted in the bearingmembers, a link having at one end arms pivotally mounted on the sleeves,a cutter head pivoted to the other end of the link, a cutter on the headoperatively connected to the shaft, a second link longer than the rstlink and out of parallelism therewith pivoted at one end to the cutterhead, and eccentrlcs connecting the other end of the second link to thearms.

24. The combination in a mining machine, with a stationary support onthe machine, and a rotatable adjustable head mounted on said support andforming part of a cutting unit, of a trapezium-shaped linkage comprisinga main link having a pivotal support on the head, an auxiliary linkhaving a pivotal support on the head and longitudinally movable withrelation thereto, a cutter head having a pivotal support on each of saidlinks, and means for moving the auxiliary link to adjust the cutterhead.

25. In a cutting unit for a mining machine, the combination with asupporting head, of a trapezum-shaped linkage including a main linkpivotally mounted on the head, a cutter head pivotally mounted at thefront end of the main link, a longitudinally movable auxiliary linkpivotally connected with the supporting head and also with the cutterhead, and co-acting means mounted on the supporting head and theauxiliary link for moving the auxiliary link to adjust the cutter head.

26. In a cutting unit for a mining machine, the combination with arotatable head, of a trapezium-shaped linkage including a main linkhaving -a pivot on said head, a cutter head having a pivotal support atthe front end of the main link, a longitudinally movable auxiliary linkhaving a pivotal support on the rotatable head and also a pivotalsupport for the cutter head, and means for moving the auxiliary link toadJust the cutter head.

27. 'I'he combination in a cutting unit for a mining machine, with asupporting head having a pivotal support thereon, of a trapezium-shapedlinkage including a longitudinally movable auxiliary link having one endmounted on said support, coacting means on said support and link formoving the latter, and means for operating one of said moving-means withrelation to the other.

FRANK B. YINGLING.

